Self-locking nut.



No. 800,189. I PATENTED SEPT. 26, 19 05.

D. 0. WARD.

SELF LOOKING NUT.

APPLICATION FILED we. 25, 1904.

UNITED STA T QsF ITENT OFFICE.

DANIEL WARD, OF OAK PARK, ILLINOIS, ASSIGNOR TO GRIP NUT COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

SELF-LOCKING NUT.

Specification of Letters Patent.

Patented Sept. 1905.

Application filed August 25,1904. $eria1 No. 222,189.

To all whom it may concern:

Be it known that I, DANIEL O. WARD, a citizen of the United States of America, residing at Oak Park, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Self-Locking Nuts, of

a simple, economical, and thoroughly eifiective device for such-purpose.

To this end my-invention consists in the novel construction and arrangement shown and described and more particularly pointed out in the claims.

In the accompanyingdrawings, wherein like reference characters indicate like or corresponding parts, Figure 1 is a plan view of my improved nut. Fig. 2 is a perspective view of a slight modification of the same. Fig. 3 is an edge view of my improved nut. Fig. 4 is a sectional view of a modification. Fig. 5 is a sectional View showing one manner of using my improved nut, and Fig. 6 is a sectional view on line 6 6 of Fig. 5.

.provided with a centrally-disposed substantially square aperture 2. The aperture is screw-threaded by means of an ordinary tap,

resulting in a screw-threaded section 3 on each side of the aperture and at the corners a' plane section not so threaded. This results in two locking-corners I 4 on each side, or

eight locking-corners in all, which in operation tend to engage with the bolt to prevent accidental retraction of the nut.

When the nut is screwed down and is in operative position, any tendency to back off is resisted by the locking-corners, which are naturally brought into lateral impinging contact with the bolt-threads. The constant spring keeps a tension on the parts. In a square aperture the sides strengthen one another against spreading and improper engagement with the bolt. in practice that a limit is reached when further strain upon the nut tends to simply spread the sides apart, resulting in improper or imperfect engagement and weakness. My

In an oblong hole it is found invention overcomes this objectionable weakness in a simple and effective manner, as the metal of the whole nut is uniformly disposed, and hence the strength is uniform throughout, obviating weak points.

In the form shown in Fig. 4 two opposite sides of the plate, as at 5 5, are formed at right angles to the plate, providing extensions for convenience in positioning a wrench when assembling the parts. These wrench extensions may be formed on all sides, if preferred; but in practice it is found that when formed as shown in Fig. 4 they satisfy every demand.

Figs. 5 and 6 show my improved nut in use in an ordinary construction, in which 6 is the bolt, 7 8 are the parts secured together, and 9 is the usual nut. My improved nut is shown at 1, illustrating the operation in a simple structure.

. I am aware of the patent issued to J. Pearson on February 2, 1897, No. 576,148, anddo not claim-the construction there described.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. As an article of manufacture, a self-locking nut comprising a plate of spring metal concave in cross-section and provided with a substantially square aperture therethrough having the four sides partially screw-threaded to present eight locking-corners.

2. As an article of manufacture, a self-locking nut comprising a cylindrically concavoconvex plate of spring metal, provided with a substantially square aperture therethrough havinga part of each of its sides screw-threaded, whereby, when the nut is flattened the threads of the threaded sections are thrown into different planes.

I 3. A self-locking nut, consisting of a nut formed of spring material and havinga cylindrically concave working face, the usual screw-threaded opening being substantially square with its screw-threads formed near the center of each of its sides, whereby'when the nut is flattened the threads of the threaded sections are thrown into dilferent planes.

4. A self-locking nut, comprising a cylindrically concavo-convex plate of spring metal, provided with a substantially square aperture therethrough, with part of each of its sides screw-threaded, and provided with Wrench extensions upon the straight edges of the nut.

5. A self-locking nut, consisting of a nut having a cylindrically concave working face, the screw-threads formed in its threaded opening being interrupted by four spaces extending through said nut, substantially evenly spaced about the threaded wall, whereby when the nut is flattened the threads of the threaded sections are thrown into difierent planes.

6. A self-locking nut, consisting of a nut having a cylindrically concave working face the serew-th reads formed in its threaded opening beinginterrupted by four grooves extending through said nut, substantially evenly spaced about its threaded wall, whereby when the nut is flattened the threads of the threaded sections are thrown into difierent planes.

7. A self-locking nut, consisting of a cylindrically concave-convex plate, havinga screwthreaded central opening in which the threads are interrupted by four spaces extending DANIEL O. 'Ahl).

\Vitnesses:

JOHN KHILL, Crmanns l. Conn. 

